The separation of the strong force and the electroweak force ____
a. provided the energy for a rapid inflation of the early Universe
b. created the cosmic microwave background radiation
c. balanced the critical density of the Universe to solve the flatness problem
d. created dark matter
e. created dark energy
a
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Why are massive main sequence stars not likely to have planets that contain life?
a. The life zones around these stars is too small. b. These stars would sweep away all of the material from which planets could form. c. These stars are too hot to allow water to exist as a liquid on any planets that might form. d. These stars are on the main sequence for too short a time to allow life to evolve. e. These stars are almost always binaries and planetary orbits are unstable around binaries.
Astronomy is pseudoscience
a. True b. False Indicate whether the statement is true or false
According to a postulate of Einstein, which of the following describes the nature of the laws of physics as one observes processes taking place in various inertial frames of reference?
a. Laws are same only in inertial frames with zero velocity. b. Laws are same only in inertial frames moving at low velocities. c. Laws are same only in inertial frames moving at near speed of light. d. Laws are same in all inertial frames.
A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a 5.0-kg object initially at rest. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive x direction. What was the initial speed of the 3.0 kg object?
a. 6.0 m/s b. 7.0 m/s c. 4.5 m/s d. 8.0 m/s e. 5.5 m/s